<h4>Tool</h4><table border="0"><tr><td valign="top"><b>Name</b></td><td valign="top">Polygon Shape Indices</td></tr><tr><td valign="top"><b>ID</b></td><td valign="top">7</td></tr><tr><td valign="top"><b>Author</b></td><td valign="top">(c) 2008 by O.Conrad</td></tr></table><hr><h4>Description</h4>Various indices describing the shape of polygons. Based on area, perimeter, maximum distance between the vertices of a polygon.

 - Interior Edge Ratio (Perimeter / Area)
 - Shape Index (Perimeter / (2 * SquareRoot(PI * Area))

References:
Lang, S., Blaschke, T. (2007): Landschaftsanalyse mit GIS.

Forman, R.T.T., Godron, M. (1986): Landscape Ecology. Cambridge.
<hr><h4>Parameters</h4><table border="1" width="100%" valign="top" cellpadding="5" rules="all"><tr><th>Name</th><th>Type</th><th>Identifier</th><th>Description</th><th>Constraints</th></tr>
<tr><th colspan="5">Input</th></tr><tr><td>Shapes </td><td>Shapes (input)</td><td>SHAPES</td><td></td><td></td></tr><tr><th colspan="5">Output</th></tr><tr><td>Shape Index (*)</td><td>Shapes (optional output)</td><td>INDEX</td><td></td><td></td></tr></table>(*) <i>optional</i>